使用正则表达式在 javascript 中进行全词搜索
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Whole word search in javascript using regex
提问by Nash3man
I'm trying to perform a whole word search in javascript using the following regex.
我正在尝试使用以下正则表达式在 javascript 中执行全词搜索。
str = "Test String C.S (example)";
var regex_search = new RegExp("\b"+search_string+"\b","g");
if(str.match(regex_search)) != null)
match = true;
else
match = false;
The above works well if I search for a normal string like 'String'. But if I search for just 'S', it returns C.S as a match. Also, searching for example returns a match but in this case I do not want a match because it has parenthesis. I just want to match the whole word only. Any suggestions would be greatly appreciated.
如果我搜索像“String”这样的普通字符串，上述方法效果很好。但是如果我只搜索“S”，它会返回 CS 作为匹配项。此外，搜索例如返回一个匹配，但在这种情况下我不想要一个匹配，因为它有括号。我只想匹配整个单词。任何建议将不胜感激。
--Edit--
- 编辑 -
Thanks to @plalx Clarified the example.
感谢@plalx 澄清了这个例子。
回答by progrenhard
Use capture groups?
使用捕获组？
.*?\b(S)
I think your second \bis breaking your code also.
我认为你的第二个\b也在破坏你的代码。
Just replace the (S) with value you want to find.
只需将 ( S)替换为您要查找的值。
Not really sure exactly what you're asking to be honest. Or what you are trying to find.
说实话，不太确定您要问什么。或者你想找到什么。
edit:
编辑：
.*?(?:^|\s)(S[^\s$]*).*?
you can prob take out the .*?at the start and the end of the regex put it in there for thoroughness.
您可以.*?在正则表达式的开头和结尾删除它，以便彻底。
replace the Sin front of [^\s$]with the value you want to check.
Also, if you want to allow more things in front of the value all you have to do is add an extra |"character"in the first capture group.
用您要检查的值替换S前面的[^\s$]。此外，如果您想在值前面允许更多的东西，您所要做的就是|"character"在第一个捕获组中添加一个额外的东西。
for example a parenthesis
例如括号
.*?(?:^|\s|\()
回答by plalx
Word boundaries are all non-word characters, which includes the .character. You will have to use something else than \b.
字边界都是非字字符，包括.字符。您将不得不使用除\b.
I am sure the regex can be simplified, but you could use something like:
我确信可以简化正则表达式，但您可以使用以下内容：
function containsWord(string, word) {
return new RegExp('(?:[^.\w]|^|^\W+)' + word + '(?:[^.\w]|\W(?=\W+|$)|$)').test(string);
}
containsWord('test', 'test'); //true
containsWord('.test', 'test'); //true
containsWord('test.something', 'test'); //false
containsWord('test. something', 'test'); //true
containsWord('test. something', 'test'); //true
containsWord('S.C', 'S'); //false
containsWord('S.C', 'S.C'); //true
